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// Tests user queries over the config servers.
(function() {
'use strict';
var getListCollectionsCursor = function(database, options, subsequentBatchSize) {
return new DBCommandCursor(
database, database.runCommand("listCollections", options), subsequentBatchSize);
};
var getListIndexesCursor = function(coll, options, subsequentBatchSize) {
return new DBCommandCursor(
coll.getDB(), coll.runCommand("listIndexes", options), subsequentBatchSize);
};
var arrayGetNames = function(array) {
return array.map(function(spec) {
return spec.name;
});
};
var cursorGetCollectionNames = function(cursor) {
return arrayGetNames(cursor.toArray());
};
var sortArrayByName = function(array) {
return array.sort(function(a, b) {
return a.name > b.name;
});
};
var cursorGetIndexNames = function(cursor) {
return arrayGetNames(sortArrayByName(cursor.toArray()));
};
var sortArrayById = function(array) {
return array.sort(function(a, b) {
return a._id > b._id;
});
};
var dropCollectionIfExists = function(coll) {
try {
coll.drop();
} catch (err) {
assert.eq(err.code, ErrorCodes.NamespaceNotFound);
}
};
/**
* Sets up the test database with with several sharded collections.
*
* @return The list of collection namespaces that were added to the test database.
*/
var setupTestCollections = function(st) {
// testKeys and testCollNames are parallel arrays, testKeys contains the shard key of the
// corresponding collection whose name is in testCollNames.
var testCollNames = ["4a1", "1a12", "3a1b1", "2a1b1c1", "b1", "b1c1", "d1"];
var testKeys =
[{a: 1}, {a: 1}, {a: 1, b: 1}, {a: 1, b: 1, c: 1}, {b: 1}, {b: 1, c: 1}, {d: 1}];
var testDB = st.s.getDB("test");
assert.commandWorked(st.s.adminCommand({enablesharding: testDB.getName()}));
var testNamespaces = testCollNames.map(function(e) {
return testDB.getName() + "." + e;
});
for (var i = 0; i < testKeys.length; i++) {
assert.commandWorked(
st.s.adminCommand({shardcollection: testNamespaces[i], key: testKeys[i]}));
}
return testNamespaces;
};
/**
* Test that a list collections query works on the config database. This test cannot detect
* whether list collections lists extra collections.
*/
var testListConfigCollections = function(st) {
// This test depends on all the collections in the configCollList being in the config
// database.
var configCollList = [
"changelog",
"chunks",
"collections",
"databases",
"lockpings",
"locks",
"mongos",
"settings",
"shards",
"tags",
"version"
];
var configDB = st.s.getDB("config");
var userAddedColl = configDB.userAddedColl;
var cursor;
var cursorArray;
dropCollectionIfExists(userAddedColl);
configDB.createCollection(userAddedColl.getName());
configCollList.push(userAddedColl.getName());
cursor = getListCollectionsCursor(configDB);
cursorArray = cursorGetCollectionNames(cursor);
for (var i = 0; i < configCollList.length; i++) {
assert(cursorArray.indexOf(configCollList[i]) > -1, "Missing " + configCollList[i]);
}
cursor = getListCollectionsCursor(configDB, {cursor: {batchSize: 1}}, 1);
assert.eq(cursor.objsLeftInBatch(), 1);
assert(cursorArray.indexOf(cursor.next().name) > -1);
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 1);
assert(cursorArray.indexOf(cursor.next().name) > -1);
assert(userAddedColl.drop());
};
/**
* Test that a list indexes query works on the chunks collection of the config database.
*/
var testListConfigChunksIndexes = function(st) {
// This test depends on all the indexes in the configChunksIndexes being the exact indexes
// in the config chunks collection.
var configChunksIndexes = ["_id_", "ns_1_lastmod_1", "ns_1_min_1", "ns_1_shard_1_min_1"];
var configDB = st.s.getDB("config");
var cursor;
var cursorArray = [];
cursor = getListIndexesCursor(configDB.chunks);
assert.eq(cursorGetIndexNames(cursor), configChunksIndexes);
cursor = getListIndexesCursor(configDB.chunks, {cursor: {batchSize: 2}}, 2);
assert.eq(cursor.objsLeftInBatch(), 2);
cursorArray.push(cursor.next());
cursorArray.push(cursor.next());
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 2);
cursorArray.push(cursor.next());
cursorArray.push(cursor.next());
assert(!cursor.hasNext());
assert.eq(arrayGetNames(sortArrayByName(cursorArray)), configChunksIndexes);
};
/**
* Test queries over the collections collection of the config database.
*/
var queryConfigCollections = function(st, testNamespaces) {
var configDB = st.s.getDB("config");
var cursor;
// Find query.
cursor = configDB.collections.find({"key.a": 1}, {dropped: 1, "key.a": 1, "key.c": 1})
.sort({"_id": 1})
.batchSize(2);
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {_id: testNamespaces[1], dropped: false, key: {a: 1}});
assert.eq(cursor.next(), {_id: testNamespaces[3], dropped: false, key: {a: 1, c: 1}});
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {_id: testNamespaces[2], dropped: false, key: {a: 1}});
assert.eq(cursor.next(), {_id: testNamespaces[0], dropped: false, key: {a: 1}});
assert(!cursor.hasNext());
// Aggregate query.
cursor = configDB.collections.aggregate(
[
{$match: {"key.b": 1}},
{$sort: {"_id": 1}},
{$project: {"keyb": "$key.b", "keyc": "$key.c"}}
],
{cursor: {batchSize: 2}});
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {_id: testNamespaces[3], keyb: 1, keyc: 1});
assert.eq(cursor.next(), {_id: testNamespaces[2], keyb: 1});
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {_id: testNamespaces[4], keyb: 1});
assert.eq(cursor.next(), {_id: testNamespaces[5], keyb: 1, keyc: 1});
assert(!cursor.hasNext());
};
/**
* Test queries over the chunks collection of the config database.
*/
var queryConfigChunks = function(st) {
var configDB = st.s.getDB("config");
var testDB = st.s.getDB("test2");
var testColl = testDB.testColl;
var testCollData = [{e: 1}, {e: 3}, {e: 4}, {e: 5}, {e: 7}, {e: 9}, {e: 10}, {e: 12}];
var cursor;
var result;
// Get shard names.
cursor = configDB.shards.find().sort({_id: 1});
var shard1 = cursor.next()._id;
var shard2 = cursor.next()._id;
assert(!cursor.hasNext());
assert.commandWorked(st.s.adminCommand({enablesharding: testDB.getName()}));
st.ensurePrimaryShard(testDB.getName(), shard1);
// Setup.
assert.commandWorked(
st.s.adminCommand({shardcollection: testColl.getFullName(), key: {e: 1}}));
for (var i = 0; i < testCollData.length; i++) {
assert.writeOK(testColl.insert(testCollData[i]));
}
assert.commandWorked(st.s.adminCommand({split: testColl.getFullName(), middle: {e: 2}}));
assert.commandWorked(st.s.adminCommand({split: testColl.getFullName(), middle: {e: 6}}));
assert.commandWorked(st.s.adminCommand({split: testColl.getFullName(), middle: {e: 8}}));
assert.commandWorked(st.s.adminCommand({split: testColl.getFullName(), middle: {e: 11}}));
assert.commandWorked(
st.s.adminCommand({movechunk: testColl.getFullName(), find: {e: 1}, to: shard2}));
assert.commandWorked(
st.s.adminCommand({movechunk: testColl.getFullName(), find: {e: 9}, to: shard2}));
assert.commandWorked(
st.s.adminCommand({movechunk: testColl.getFullName(), find: {e: 12}, to: shard2}));
// Find query.
cursor =
configDB.chunks.find({ns: testColl.getFullName()}, {_id: 0, min: 1, max: 1, shard: 1})
.sort({"min.e": 1});
assert.eq(cursor.next(), {min: {e: {"$minKey": 1}}, "max": {"e": 2}, shard: shard2});
assert.eq(cursor.next(), {min: {e: 2}, max: {e: 6}, shard: shard1});
assert.eq(cursor.next(), {min: {e: 6}, max: {e: 8}, shard: shard1});
assert.eq(cursor.next(), {min: {e: 8}, max: {e: 11}, shard: shard2});
assert.eq(cursor.next(), {min: {e: 11}, max: {e: {"$maxKey": 1}}, shard: shard2});
assert(!cursor.hasNext());
// Count query with filter.
assert.eq(configDB.chunks.count({ns: testColl.getFullName()}), 5);
// Distinct query.
assert.eq(configDB.chunks.distinct("shard").sort(), [shard1, shard2]);
// Group query.
result = configDB.chunks.group({
key: {shard: 1},
cond: {ns: testColl.getFullName()},
reduce: function(curr, res) {
res.chunks++;
},
initial: {chunks: 0},
finalize: function(res) {
res._id = res.shard;
}
});
assert.eq(
sortArrayById(result),
[{shard: shard1, chunks: 2, _id: shard1}, {shard: shard2, chunks: 3, _id: shard2}]);
// Map reduce query.
var mapFunction = function() {
if (this.ns == "test2.testColl") {
emit(this.shard, 1);
}
};
var reduceFunction = function(key, values) {
return {chunks: values.length};
};
result = configDB.chunks.mapReduce(mapFunction, reduceFunction, {out: {inline: 1}});
assert.eq(result.ok, 1);
assert.eq(sortArrayById(result.results),
[{_id: shard1, value: {chunks: 2}}, {_id: shard2, value: {chunks: 3}}]);
};
/**
* Test queries over a user created collection of an arbitrary database on the config servers.
*/
var queryUserCreated = function(database) {
var userColl = database.userColl;
var userCollData = [
{_id: 1, g: 1, c: 4, s: "c", u: [1, 2]},
{_id: 2, g: 1, c: 5, s: "b", u: [1]},
{_id: 3, g: 2, c: 16, s: "g", u: [3]},
{_id: 4, g: 2, c: 1, s: "a", u: [2, 4]},
{_id: 5, g: 2, c: 18, s: "d", u: [3]},
{_id: 6, g: 3, c: 11, s: "e", u: [2, 3]},
{_id: 7, g: 3, c: 2, s: "f", u: [1]}
];
var userCollIndexes = ["_id_", "s_1"];
var cursor;
var cursorArray;
var result;
// Setup.
dropCollectionIfExists(userColl);
for (var i = 0; i < userCollData.length; i++) {
assert.writeOK(userColl.insert(userCollData[i]));
}
assert.commandWorked(userColl.createIndex({s: 1}));
// List indexes.
cursorArray = [];
cursor = getListIndexesCursor(userColl, {cursor: {batchSize: 1}}, 1);
assert.eq(cursor.objsLeftInBatch(), 1);
cursorArray.push(cursor.next());
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 1);
cursorArray.push(cursor.next());
assert(!cursor.hasNext());
assert.eq(arrayGetNames(sortArrayByName(cursorArray)), userCollIndexes);
// Find query.
cursor = userColl.find({g: {$gte: 2}}, {_id: 0, c: 1}).sort({s: 1}).batchSize(2);
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {c: 1});
assert.eq(cursor.objsLeftInBatch(), 1);
assert.eq(cursor.next(), {c: 18});
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {c: 11});
assert.eq(cursor.objsLeftInBatch(), 1);
assert.eq(cursor.next(), {c: 2});
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 1);
assert.eq(cursor.next(), {c: 16});
assert(!cursor.hasNext());
// Aggregate query.
cursor = userColl.aggregate(
[
{$match: {c: {$gt: 1}}},
{$unwind: "$u"},
{$group: {_id: "$u", sum: {$sum: "$c"}}},
{$sort: {_id: 1}}
],
{cursor: {batchSize: 2}});
assert.eq(cursor.objsLeftInBatch(), 2);
assert.eq(cursor.next(), {_id: 1, sum: 11});
assert.eq(cursor.next(), {_id: 2, sum: 15});
assert(cursor.hasNext());
assert.eq(cursor.objsLeftInBatch(), 1);
assert.eq(cursor.next(), {_id: 3, sum: 45});
assert(!cursor.hasNext());
// Count query without filter.
assert.eq(userColl.count(), userCollData.length);
// Count query with filter.
assert.eq(userColl.count({g: 2}), 3);
// Distinct query.
assert.eq(userColl.distinct("g").sort(), [1, 2, 3]);
// Group query.
result = userColl.group({
key: {g: 1},
reduce: function(curr, res) {
res.prod *= curr.c;
},
initial: {prod: 1},
finalize: function(res) {
res._id = res.g;
}
});
assert.eq(sortArrayById(result),
[{g: 1, prod: 20, _id: 1}, {g: 2, prod: 288, _id: 2}, {g: 3, prod: 22, _id: 3}]);
// Map reduce query.
var mapFunction = function() {
emit(this.g, 1);
};
var reduceFunction = function(key, values) {
return {count: values.length};
};
result = userColl.mapReduce(mapFunction, reduceFunction, {out: {inline: 1}});
assert.eq(result.ok, 1);
assert.eq(sortArrayById(result.results), [
{_id: 1, value: {count: 2}},
{_id: 2, value: {count: 3}},
{_id: 3, value: {count: 2}}
]);
assert(userColl.drop());
};
var st = new ShardingTest({shards: 2, mongos: 1});
var testNamespaces = setupTestCollections(st);
var configDB = st.s.getDB("config");
var adminDB = st.s.getDB("admin");
testListConfigCollections(st);
testListConfigChunksIndexes(st);
queryConfigCollections(st, testNamespaces);
queryConfigChunks(st);
queryUserCreated(configDB);
queryUserCreated(adminDB);
})();
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